A straw man is a common form of argument and is an informal fallacy based on giving the impression of refuting an opponent's argument, while actually refuting an argument which was not advanced by that opponent.[1]
I will say that her postulated Atheist meme #1 is, in my experience, accurate. Many atheists I know do say this or something like it.
She introduces the straw man in her Meme #2. Where have atheists proposed this? No where that I've ever seen.
There are attempts to create moral systems not based on the divine. The author doesn't sight any of them, or their key axioms. The one I am most familiar with is Humanism. As the name implies Humanism values Humans, and Humanists have as an axiom "all Human life has value". This is widely understood by anyone who has bothered to study the subject, so I assume the author is just creating junk memes for her own joy in destroying them.
Disapointing. Having created the straw man, she does a good job of ritualistic burning of it. We can all feel purified now by the destruction of atheist morality!
To make that big leap that atheists do not value human life makes no sense and is groundless, as you say.
Further, plenty of theists do not value human life. Look at the supposedly religious folks who are fine with abortion.